RU151116U1 - WIRE FOR ROLLING COMPOSITION OF RAIL TRANSPORT - Google Patents

Abstract

1. A wire for rolling stock of a rail transport, comprising a conductive core, insulation from an organosilicon rubber compound forming a non-conductive ceramic layer and a sheath of an organosilicon rubber mixture not spreading combustion, characterized in that the conductive core is formed by unidirectionally twisted copper wires and strands .2. The wire according to claim 1, characterized in that it contains a protective braid of synthetic fibers, overlaid on top of the sheath. A wire according to claim 2, characterized in that the braid is impregnated with silicone varnish or liquid rubber. 4. A wire according to claim 2, characterized in that a layer of organosilicon rubber compound is applied over the braid by extrusion. Wire according to any one of paragraphs. 1-4, characterized in that it is additionally equipped with a screen in the form of a braid of copper wires located between the insulated core and the sheath.

Description

The utility model relates to the field of electrical engineering and can be used in the design of electrical cables for rolling stock of the subway and other modes of transport.

Known wire for rolling stock of rail transport, containing a conductive core and insulation made of silicone rubber compound, forming a non-conductive ceramic layer during combustion and a shell of silicone rubber compound that does not spread combustion (RF patent for utility model No. 49344,2005). This technical solution is the closest to the offer, in terms of features. Known wire has a high fire safety, including fire resistance.

However, it has low flexibility. When mounted on rolling stock, the wire undergoes extreme bending, both in the radial direction and in the axial direction. With insufficient flexibility of the wire, a change in the geometry of the conductive core, deformation of the insulation and the sheath, which increases the likelihood of failure of the wire during operation of the product.

During installation, the flexible wire requires less effort when assembling it into bundles, laying in cable ducts and connecting to electrical devices. In this regard, the number of cases of deformation of the insulation and the sheath, as well as violations of the geometry of the conductive core, which reduces the likelihood of failure of the wire in the finished product, is reduced.

The technical result achieved during the development of the claimed wire design for the rolling stock of rail vehicles consists in increasing the flexibility of the finished product in combination with high fire safety and fire resistance and, as a result, in increasing the service life of the finished product.

The technical result is achieved by the fact that in a wire for rolling stock of a rail transport containing a conductive core, insulation is made of an organosilicon rubber compound forming a non-conductive ceramic layer during combustion and a sheath of an organosilicon rubber mixture that does not propagate combustion, the conductive vein is formed by unidirectionally twisted copper wires and strands .

The wire may further comprise a protective sheath of synthetic fibers, overlaid on top of the sheath. The braid can be impregnated with silicone varnish or liquid rubber or coated with a layer of silicone rubber by extrusion. In any embodiment, the cable may comprise a screen in the form of a braid of copper wires, laid on top of an insulated core.

The utility model is illustrated in the drawing, which shows a wire in section. The wire contains a conductive core 1, insulation 2, sheath 3, shield 4 and protective sheath 5.

The following information confirms the industrial applicability of the utility model.

The insulating silicone rubber compounds that form the ceramic layer during combustion are known polymer materials manufactured in Russia and abroad, for example, under the brand name Petasil 2552 of the Penta company, under the brands ELASTOSIL 502/75 and ELASTOSIL 503/75, by Wacker Chemie AG Germany. The flame retardant silicone rubber compounds used for sheathing wires and cables are also produced in Russia and abroad, for example, under the Pentas brand 2702, under the Unisil 20-8180FR brand of BMP Chemical, under the ELASTOSIL 501 / brand 75, by Wacker Chemie AG Germany. Complex polyester threads - TU BY 400031289.029-2009 RUE SPO Khimvolokno. Silicon electrical insulating varnish - GOST 16580-70. Liquid rubbers, for example, are manufactured by Wacker Chemie AG Germany under the brand ELASTOSIL® LR 3005 or by Momentive USA under the brand SILOPREN® LSR 2540. For coating the protective braid by extrusion, for example, PENTASIL® silicone rubber is used 1403 of the Penta-91 company.

The manufacturing technology of the proposed wire is traditional for this type of product. Copper wires for a conductive core are made according to TU 16.705-492-2005 from a copper wire rod MM, produced according to TU 16.705-491-2001. A strand is a workpiece twisted from several copper wires. The twisting of wires and strands into the core 1 is carried out on standard twisting equipment, and the insulation 2 is applied to the conductive core and then to the insulated cores of the sheath 3 by an extrusion machine.

Tests of wire samples were carried out in order to determine the coefficient of its flexibility and the moment of bending.

The coefficient of flexibility is defined as the ratio of the diameter of the wire to the diameter of its own bend.

The bending moment is determined by the formula:

M = 9.8 · π · Rc · m / 2

where, m is the mass of one meter of wire in kg;

Rc is the own bending radius of the wire in m. The results are presented in the following table.

Indicators Proposed wire Famous wire Flexibility factor 0.058 0,045 Bending moment, Nm 17.55 26.34

The results show that the proposed wire is characterized by greater flexibility.

Tests for non-proliferation of combustion during group laying according to category “A” according to GOST Ρ IEC 60332-3-22 and fire resistance according to GOST Ρ IEC 60332-3-22 showed compliance of the proposed wire with fire safety requirements.

During installation, the flexible wire requires less effort when assembling it into bundles, laying in cable ducts and connecting to electrical devices. In this regard, the number of cases of deformation of the insulation and the sheath, as well as violations of the geometry of the conductive core, which reduces the likelihood of failure of the wire in the finished product, is reduced.

Thus, a technical result is achieved - increasing the service life of the finished product.

Claims (5)

1. A wire for rolling stock of a rail transport, comprising a conductive core, insulation from an organosilicon rubber mixture forming a non-conductive ceramic layer and a sheath of organosilicon rubber mixture that does not propagate combustion, characterized in that the conductive core is formed by unidirectionally twisted copper wires and strands . 2. The wire according to claim 1, characterized in that it contains a protective braid of synthetic fibers, overlaid on top of the sheath. 3. The wire according to claim 2, characterized in that the braid is impregnated with silicone varnish or liquid rubber. 4. The wire according to claim 2, characterized in that a layer of silicone rubber is applied over the braid by extrusion. 5. The wire according to any one of paragraphs. 1-4, characterized in that it is additionally equipped with a screen in the form of a braid of copper wires located between the insulated core and the sheath.

Images